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Method for preparing short-chain fatty acid vinyl ester series cement dispersant

A technology of fatty acid vinyl ester and cement dispersant, which is applied in the field of dispersant for cement concrete, can solve the problems that affect the rapid popularization and application of chemical admixtures, the chemical structure is not diverse, the selection range of raw materials is narrow, and the like, and achieves good popularization and application value. , broaden the connotation and application, improve the effect of market competitiveness

Inactive Publication Date: 2012-07-18
XINYANG LINGSHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, as the precursor of enol groups, the characteristics of short-chain fatty acid vinyl esters are far more than these. It can be copolymerized with other unsaturated compounds with polar groups and then undergo alcoholysis to achieve hydroxyl groups on the main chain. Agglomerates, thus providing good hydrophilic and water-retaining properties, but no patents have been reported on the use of this property to prepare cement dispersants
[0013] In addition, the current high-performance polycarboxylate superplasticizers for concrete are generally prepared by the method of copolymerization of alkenoic acid monomers and unsaturated polyoxyethylene ethers. Rapid promotion and application in the field of chemical admixtures

Method used

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  • Method for preparing short-chain fatty acid vinyl ester series cement dispersant
  • Method for preparing short-chain fatty acid vinyl ester series cement dispersant
  • Method for preparing short-chain fatty acid vinyl ester series cement dispersant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Make 0.86g of vinyl acetate into an aqueous solution with a mass fraction of 1%, stir and heat up to 60°C, and simultaneously add dropwise 8.75g of 1% potassium persulfate aqueous solution and 55.44g of 30% acrylamide and propylene The mixed aqueous solution of sodium sulfonate (containing 11.83g of acrylamide and 4.8g of sodium propylene sulfonate) was dropped within 5 hours, and the temperature was raised to 75°C with continuous stirring. After 2 hours of reaction, the temperature was lowered to 15°C with 17.49g Washed with methanol, and dried at 90°C to obtain a polymer product.

[0043] The polymerization product is made into a methanol solution with a mass fraction of 60%, and then the temperature is raised to 30°C, and 4.3g of a methanol solution with a mass fraction of 1% potassium hydroxide is added dropwise to the system. The alcoholysis product was obtained under vacuum.

[0044] The alcoholysis product was made into an aqueous solution with a mass fraction o...

Embodiment 2

[0047] After the cement dispersant obtained in Example 1 with a mass fraction of 40% was stored at 6° C. for 30 days, its implementation effect was measured.

Embodiment 3

[0049] Make 5g of vinyl propionate into an aqueous solution with a mass fraction of 50%, stir and heat up to 70°C, and simultaneously add dropwise 7.64g of a 30% mass fraction of ammonium persulfate aqueous solution and 89.65g of a 20% mass fraction of methacrylamide The aqueous solution mixed with sodium styrene sulfonate (containing 16.35g methacrylamide and 1.58g sodium styrene sulfonate) was dropped within 2 hours, and the temperature was raised to 85°C with continuous stirring, and after 1 hour of reaction, the temperature was lowered to 50°C °C was washed with 11.47 g of isopropanol, and dried at 120 °C to obtain a polymer product.

[0050] The polymerization product is made into a methanol solution with a mass fraction of 20%, and then the temperature is raised to 60°C, and 0.33g of a methanol solution with a mass fraction of 15% potassium hydroxide is added dropwise to the system. The alcoholysis product was obtained under vacuum.

[0051] The alcoholysis product was ...

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Abstract

The invention relates to a method for preparing a short-chain fatty acid vinyl ester series cement dispersant. Short-chain fatty acid vinyl ester is used as a copolymerization monomer for preparing the cement dispersant material, namely the method comprises the following steps of: performing ternary polymerization by using the short-chain fatty acid vinyl ester, an unsaturated easily-dehydrated compound and an unsaturated sulfonic acid (sulfonate) compound as monomers, performing full alcoholysis and hydrolysis on the polymerization product, performing condensation reaction on the hydrolyzed product and a methoxy polyoxyethylene ether compound under the action of a catalyst, and thus obtaining the cement dispersant. The invention has the advantages of strong process controllability, high structural activity, energy conservation and environment friendliness; the main chain of molecules carries various strong adsorption groups by the polymerization reaction, the water holding property of the alcoholysis product of the short-chain fatty acid vinyl ester is fully exerted, and hydrophilic side chains are grafted to the main chain by the condensation reaction to form the cement dispersant with the novel structure; and the granule dispersibility, the flowability and the age holding capacity of cement slurry are fully improved, the workability of cement is improved, and the cement dispersant shows excellent cement adaptability.

Description

technical field [0001] The invention relates to the technical field of a dispersant for cement concrete, in particular to a polymer product of a ternary copolymerization of a short-chain fatty acid vinyl ester, an unsaturated easily hydrolyzable compound and an unsaturated sulfonic acid (salt) compound and a methoxy The specific preparation method of polyoxyethylene ether compound condensation synthesis cement dispersant. Background technique [0002] Since the continuous promotion of concrete chemical admixtures in the middle of last century, concrete production and construction technology has been developed by leaps and bounds, and the application of concrete materials has become increasingly widespread due to the improvement of its performance. Various new types of concrete, such as high-performance concrete, self-compacting vibration-free concrete, active powder concrete, fiber grouted concrete, and underwater non-discrete concrete, have been successfully developed and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F220/56C08F228/02C08F218/08C08F8/12C08F212/14C08F218/10C08F220/14C08F220/58C08F220/28C04B24/16C04B103/40
Inventor 刘晓王子明路芳卢子臣崔素萍兰明章毛倩瑾王亚丽
Owner XINYANG LINGSHI TECH CO LTD
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